Remediation of arsenic-contaminated paddy soil by iron-modified biochar.

Environmental Science and Pollution Research International
Chuan WuZiyan Qian

Abstract

Arsenic contamination in paddy soils has aroused global concern due to its threats to food security and human health. Biochar modified with different iron materials was prepared for arsenic (As) immobilization in contaminated soils. Soil incubation experiments were carried to investigate the effects of biochar modified with Fe-oxyhydroxy sulfate (Biochar-FeOS), FeCl3 (Biochar-FeCl3), and zero-valent iron (Biochar-Fe) on the pH, NaHCO3-extractable As concentrations, and the As fractions in soils. The scanning electron microscope and X-ray diffraction analysis demonstrated that iron was successfully loaded onto the surface or embedded into the pores of the biochar. Addition of Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe had no significant effects on the soil pH but significantly decreased the contents of NaHCO3-extractable As in soils by 13.95-30.35%, 10.97-28.39%, and 17.98-35.18%, respectively. Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe treatments decreased the concentrations of non-specifically sorbed and specifically sorbed As fractions in soils, and increased the amorphous and poorly crystalline, hydrated Fe, Al oxide-bound, and residual As fractions. Compared with the other iron-modified biochars, Biochar-FeOS showed the m...Continue Reading

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Citations

Aug 14, 2020·Environmental Science. Processes & Impacts·Yuchi ZhongYong Sik Ok
Jan 3, 2020·Bulletin of Environmental Contamination and Toxicology·Vladimír FrištákHans-Peter Schmidt
Nov 21, 2020·Journal of Nanoscience and Nanotechnology·Changsheng YueYanshan Cui
Jan 10, 2021·Bulletin of Environmental Contamination and Toxicology·Abhishek Kumar, Tanushree Bhattacharya
Jan 26, 2021·Archives of Microbiology·Ivan Arroyo-HerreraMaría Soledad Vásquez-Murrieta
Jan 8, 2021·Environmental Science and Pollution Research International·Yao YaoBo-Han Liao
Nov 26, 2018·The Science of the Total Environment·Hanna FrickKristian K Brandt
Dec 9, 2020·Environmental Toxicology and Chemistry·Clement Oluseye OgunkunlePaul Ojo Fatoba
Apr 19, 2021·Environmental Science and Pollution Research International·Dongmei WangJon Chorover

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